001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import java.util.HashSet;
018    import java.util.Set;
019    
020    /**
021     * @author Shuyang Zhou
022     */
023    public class ThreadLocalRegistry {
024    
025            public static ThreadLocal<?>[] captureSnapshot() {
026                    Set<ThreadLocal<?>> threadLocalSet = _threadLocalSet.get();
027    
028                    return threadLocalSet.toArray(
029                            new ThreadLocal<?>[threadLocalSet.size()]);
030            }
031    
032            public static void registerThreadLocal(ThreadLocal<?> threadLocal) {
033                    Set<ThreadLocal<?>> threadLocalSet = _threadLocalSet.get();
034    
035                    threadLocalSet.add(threadLocal);
036            }
037    
038            public static void resetThreadLocals() {
039                    Set<ThreadLocal<?>> threadLocalSet = _threadLocalSet.get();
040    
041                    if (threadLocalSet == null) {
042                            return;
043                    }
044    
045                    for (ThreadLocal<?> threadLocal : threadLocalSet) {
046                            threadLocal.remove();
047                    }
048            }
049    
050            private static ThreadLocal<Set<ThreadLocal<?>>> _threadLocalSet =
051                    new InitialThreadLocal<Set<ThreadLocal<?>>>(
052                            ThreadLocalRegistry.class + "._threadLocalSet",
053                            new HashSet<ThreadLocal<?>>());
054    
055    }